Rotary pump.



'w. N. CUMMINGS.

ROTARY PUMP.

APPLICATION FILED AUG. 1. I916.

Patented July 16, 1918.

MIA Cu WILLARD N. CUMMINGS, 0F LOS ANGELES, CALIFORIIIA.

ROTARY PUMP.

raraoai.

Specification of Letters Patent.

Patented July 118, I918.

Application filed August 1, 1916. Serial No. 112,633.

To all whom z't may concern:

Be it known that I, WILLARD N. CUM- IMINGS, a citizen of the United'States, residinvented new and useful Improvements in Rotary Pumps, of which the following is a specification.

My invention relates to single piston rotary pumps. In rotary pumps in common use the suction and discharge ports I are placed in the side walls of the pump chamher. This necessitates the construction of a well shaft of sufficient diameter to permit the pump chamber and the discharge pipe on the side thereof to be lowered therein.

It is the object of my invention to place the suction and discharge ports in 'the end walls of the pump chamber so that the well shaft may be constructed of less diameter than is required when the ports and suction and discharge pipes are at the side of the pump chamber. Other advantages will be hereafter specified.

In the drawings application,

Figure 1 is a sectional view of a portion of a well with my pump shown in place therein.

Fig. 2 is an enlarged section of the pump chamber on the line 22 of Fig. 3.

Fig. 3 is an enlarged central vertical section of the pump chamber with portions of connected mechanism shown partly in section and partly in elevation.

Referring to the drawings?) is the well hole or shaft which is lined with the usual well casing 6. In cross section the pump chamber casing 7 is, in general outline, cylindrical and is of such diameter and length as may be desired for the work to be accomplished. Mountedin casing 7 and eccentric to the longitudinal diameter thereof is a cylindrical piston 8 whose diameter: is a little less than the diameter of the pump chamber 9. Piston 8 has a plurality of longitudinal radial slots 10 therein which extend from the periphery to nearly the center thereof, in which slots are mounted piston blades 11. In the drawings I have shown four of these blades and slots but a less or a.

water number may be used. if desired. Vhen an even number of these blades are used I connect the opposed blades by guide pins 12 which are placed near the ends of forming a part of this the blades and which slide in the piston and I through the operating shaft 13. Piston 8 has trunnions 1i and 15 which extend into bosses 16 and 17 on the end walls 18 and 19 of chamber 9. Recess 20 into which trunnion 1% is received is a little deeper than the length of trunnion 1i and balls 21 fill the recess below the trunnion and form a ball bearing for the end thereof. Shaft 18 is rigidly secured in piston 8 and extends to and above the ground and has secured thereto a pulley 22 which is driven by a belt. not shown. Surrounding shaft 13 and extending to above the ground is an oil pipe 28 which is screwed into boss 17. Just above the boss a small branch pipe 24: is connected to pipe 28 and extends from pipe 23 to boss 16. A port 25 connects pipe 2 with the ball race. A frame 26 provides a mounting for the upper end of shaft 13. ball race shown at 27 having one part mounted on frame 26- and the other secured to shaft 13 carries the weight of the shaft. Pipe 28 carries the weight of casing 7 and connected parts. Shaft 13 has a slip joint therein, not shown, near the piston to prevent any of the weight of the shaft above the joint from being borne by the piston or bearings thereof. As shown in the drawings the piston contacts with casing 7 at one point and extending from this point of contact on one side thereof and from near one to near the other end is groove 26 which gradually increase in depth and extends to a poiint a. little beyond the discharge port 29. Groove 26 may be called the relief groove, and the object thereof is to permit the fluid that would otherwise be trapped between casing 7, piston 8 and blades 11 to flow around blades 11 as the blades approach the point of contact between the piston and casing. A. I suction: pipe 30 may be connected to head 18 at. port 28 if desired to place the pump above the surface of the water. A discharge pipe 31 is connected to head 19 and extends to the top of the ground. By providing suit able guides for the piston blades the relief groove could be omitted.

From the foregoing description it will be apparent that by having the suction and discharge ports in the end walls of the pumping chamber I. can use a chamber of considerable length and of small diameter and that the well shaft or hole need be onlylarge enough toallow the heads to pass there through, thus making a deep well pump of well of small diameter.

great capacity which can be installed in a" Having described my invention What I claim is A single piston rotary pump comprising a pump chamber casing Whose side Walls are cylindrical and provided with a suction and a relief groove therein; parallel end Walls secured to said side walls, the upper end Wall having a discharge port therein and a recess in its lower face, and the lower end Wall having a suction port therein and a recess in its upperface, said recesses being eccentrically located as to the center of said end Walls, said ports being on opposite sides of the pump chamber; a cylindrical iston having trunnions on the ends thereo said trunnions entering the recesses in said end walls, said piston having radial-slots therein for the reception of piston blades, the lower trunnion being shorter than the recess in which it is received; balls in said lower recess; piston blades slidably mounted in said slots; an operating shaft rigidly mounted in said piston and projecting through the upper end Wall of said casing; a lubricating pipe surrounding said operating shaft and secured at the bottom thereon to said upper head; a branch pipe leading from said lubricating pipe to and terminating in the recess in the lower head; and a discharge pipe connected to the upper head.

In Witness that I claim the foregoing I have hereunto subscribed my name this 12th day of June, 1916.

WILLARD N. CUMMINGS. 

